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Non-condensables and iced up coil

If a small amount of moisture is in the system how long before it shows up? Had one yesterday, there was a combination of problems, 410a, clean filter blower and evap, and was installed in a rain storm. Low suction 110psi, odt 82 highside 295. This is a new install 5 weeks old. I figure install didnt check the charge and i added a little. Suction stayed the same liquid moved between 320 and 550. I shut down recovered, check the piston and weighted in the posted charge. Suction 110 liquid 300. Checked airflow the house has 2 8x24 returns 9 supplies are 5" runs off the duct. I removed the blower adjusted belt tension and ran with the blower door off. Pressures increased. Informed the customer about the issues. Was the swing in pressure from moisture, a slight over charge or lack of air flow?

The cust has an old oil furnace still. The gas line is going in next month. Then a new gas furnace. I think we are doing the furnace install. Im not sure why we just didnt install a furnace at the same time. We can alway run the gas line later.